Form for manufacturing concrete draintiles



Aug. 14, 1951. L. s. OSBORN 4,

FORM FOR MANUFACTURING CONCRETE DRAIN TILES Filed Aug. 11, 1950 V v V 2 Sheets-Sheet 1 INVENTOR. LYLE G. OSEOE/V A 7'7'OENEYS.

L. G. OSBORN FORM FOR MANUFACTURING CONCRETE DRAIN TILES Aug. 14, 1951 2 Sheets-Sheet 2 Filed Aug. 11, 1950 INVENTOR. LYLE s. osaae/v,

yam mmwwmm ATTOENEYS.

Patented Aug. 14, 1951 OFFICE ass-Mae FORM Foa MANUFACTURING coNcn-Era DRAINTILES t e. cam; 'Wateffoid, rs. Application August 11, 1950, Serial No. 178,874 a dams- 2J5-i181 V This invention relates. to reusable forms and I era 1 d or on a suitable supporting structure, w ssimple and du ble in c s ruct n. u

u ical to manufacture, easy to use, and highly efificient in operation.

Qther obje ts and advantages will'become apparent from a consideration of the following descr pt o d he appen d la m n co junction with the accompanying drawings wherein:

Figure 1 is a side elevational view of a ical f orm illustrative of the invention;

Figure 2 is a top plan. view of the] forn lillustratd in Figure 1.;

Figure 3 is an end'levatijonal View of the form illustrated in Figures 1 and 2;

Figure 4 is a transverse cross sectional view on the line 44 of Figure I;

Figure 5 is a longitudinal cross sectional view on, the line 5.5 Of Figure 2;

Figure 6" is a perspective view ofan inner cylinder end closure plate constituting an operative component of the form assembly;

Figure 7 is a perspective view of an inner cylinder spacer;

Figures is a perspective view of a fragmentary portion of the outer cylinder-portion of the form;- and Figure 9 isa perspective view-of afragmentary portion of the inner cylinder. With continued reference to the drawings; the formassembly of the present invention com-- prises, in general, an inner cylinder i0, end closure plates H andt2 closing the-respectiveh opposite endsof the inner cylinder, a spacer l3- disposedin a longitudinallyextending slot in the inner cylinder to hold the inner cylinder in proper shape durlng the casting operation, an outer-cylinder M, rectangular andwalls I 5 and 6: closing the: respectively: opposite ends. or the outer cylinder, spikes III and [Be projecting from the. end walls. I35:v and I6 inwardly: through aper' tures in the end closure plates H and? [2 to. hold the inner cylinder substantially coaxial with the outer cylinder, and. springs. I-9. and 20; .connected between the. end: walls. I5: and i5. tea-resiliently 2 hold these end walls against the. pp s t n of the enter cylinder.

The inner cylinder L0. is formed of suitable Sheet metal. preierably of. a. resilient nature, and has anoutside diameter substantially equal to the desired inside diameter of the tubular con- Qhiect to the cast the mold. This inner cyli der ha a slot 2t extending longitudinally thereof from one end to the other and has inwe rdly dire ted flan es Z2. and 3. exte d n on alehe. each. ids i t e-s o Z in spa p rt. ubsta ially pa a lel relationship to each other. V

The shelter '3: anclchea e bo of channel ieee s s ha in a W 24 he wi th 9; w h. i su t n al equa t t wi h of wh n the-f m srrqre as mb .e. an ubsta iall para a ge i esl 2.6.- .s e ed et een the. an es 22 and f the inner eylind The-length oi thespacer u in al y e ua t ens h o t inner ewer s di g n he t 14 11 that. its web is flush with the of the, inner cylinder In, as. is

hi y" nra gur Each'of the end closure plates II and I 2 is a sheet metal; body of generally circular shape hava peripheral. notch, 21 of rectangular shape d 0 a. site to receive the flanges 22 and 23 of der and the. portibn. of the spacer 13 p oyect ng inwardly of these flanges. The sides'cf the notch 21 are preferab y Qutwardly divereent or a e te pe t c os receive both the flan e 22 51. 23 0. 1 t r cylinder. d theflan'ges Z5 and ZB of the. spacer. Opposite the npteh Z} the end. closure. plate is provided with a reetangular tab 28 GXte'nding perpendicularly iroyn' one side of the plate, at. the periphery of the latter to assist in v mai taining the plate in proper pesitipn n the'inlr'ier cylinder and substantially perpendicular to the inner cylinder axis. The sides of the plate] I between the notch 2'? and the tab 28' may be flattened, as indicated at 29 and 30,t0 facilitate placing the end closure plates in the inner cylinder and removing them therefrom. Each end closure plate is provided with a centrally dispesed aperture, as indicated at 31, in Figure 6-; I I

Lheouter cylinder l-fl is larg'er in diameter than the inner cylinder I 0 and is of substantially the that their outer surfaces lie substantially in a common plane which is tangential to the outer surface of the outer cylinder l4 along the midwidth location of the slot 32.

Each of th end walls l5 and It comprises a rectangular sheet metal body having flanges 35 and 36 disposed one along each of two opposite edges or the body and having triangular extensions 31 and 38 disposed one along each of the other two edges of the body.

When the form is in operative position, the flange 36 is at the bottom, the flange 35 at the top, and the extensions 3'! and"' 3 8 substantially vertically disposed at respectively opposite sides of the outer cylinder l4, as is.particularly illustrated in Figure 4.

The upper flange 35 is provided with a rec-,

tive to the mid-length location of this flange'and the opposite end edgessof which are received under the flanges 33 and 34 to hold these flanges in a predetermined spaced'apart and substantially parallel relationship to each other.

The outer cylinder flanges being firmly held at the opposite ends of the outer cylinder by the top flanges of the end walls l5 and It, the outer cylinder is firmly held in predetermined shape with a predetermined width of the slot 32.

The extensions 31 and 38 taper symmetrically in a direction away from the end wall l5 and are respectively provided at their distal ends with hook formations 39 and 40. The two extensions on each of the end walls l5 and 16 are substantially parallel to each other, as is clearly illustrated in Figure 2, and are disposed at respectively opposite sides of-the outer cylinder and spaced from the latter. The extensions 31 and 38 extend from the end wall l5 toward the mid-length location of the outer cylinder and the corresponding extensions on the end wall I6 extend from this end wall also toward the midlength location of the outer cylinder, complementary extensions on thetwo end walls being disposed at the same sides of the outer cylinder.

The springs I9 and are connected at their opposite ends to the hook formations on each pair of complementary-end wall extensions and resiliently pull the end walls together, holding them firmly against the corresponding ends of the outer cylinder of the form.

The spikes I! and I8 carried by'the' end walls I5 and I6 extend through thecentral aperatures provided in the end closure plates and 12 of the inner cylinder and hold the inner cylinder substantially coaxial with the outer cylinder so that a circumferential space of' substantially uniform thickness is provided between the outer and inner cylinders, as is particularly illustrated in Figure 4.

1 With the form completely assembled, as described above, plastic concrete is poured into the form through the slot 32 in the outer cylinder and is tamped into the space between the outer and inner cylinders until this space is com-. pletely filled. The surface of the concrete between the adjacent edges of; the flanges 33 and 34 is then leveled oil with a suitable trowel or other leveling instrument and the concrete permitted to harden.

When it is desired to remove the hardened tubular object from the form, the springs l9 and 20 are first unhookedfrom one of the end .walls and the end walls areremoved. from the'form assembly. Removal of the end walls releases the flanges 33 and 34 of the outer cylinder and permits the outer cylinder to expand so that it can be withdrawn from the casting. The end closure plates II and 12 of the inner cylinder are then removed and the expander or spacer I3 is next removed from the inner cylinder permitting the inner cylinder to contract. The inner cylinder is then withdrawn from the casting and the casting is entirely free of the form and may be stored in a suitable location for seasoning. The form may then be reassembled in the manner described above and again filled with plastic concrete to produce another casting.

As stated above, the inner and outer cylinders are preferably formed of a resilient sheet ma- -terial to facilitate their removal from a hardened casting. The inner cylinder end plate, the inner cylinder spacer and the outer cylinder end walls are formed of sheet material of heavier gauge than the material of the inner and outer cylinders so that the end plates, spacer and end walls are substantially rigid in construction.

By using a relatively dry mix, such as is used in manufacturing concrete building blocks, the setting time of the concrete is materially shortened and the form assembly of the present invention can be utilized to produce concrete drain tiles at a. rapid rate.

The invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiment is, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are, therefore, intended to be embraced therein.

What is claimed is: V

l. A form for'molding tubular concrete objects comprising an inner cylinder having a longitudinally extending slot and inwardly directed flanges disposed one along each side of said slot, a spacer of channel shaped cross section disposed between said flanges with its web portion substantially flush with the surface of said cylinder, centrally apertured end closure plates of substantially circular shape disposed one in each end of said inner cylinder, an outer cylinder surrounding said inner cylinder and circumferentially spaced therefrom, said outer cylinder having a longitudinally extending slot therein and outwardly directed flanges disposed one along each side of said slot, rectangular end walls disposed one against each end of said outer cylinder, a flange on each end wall-having a notch therein receiving the corresponding ends of the flanges on said outer cylinder to hold suchfianges in predetermined spaced apart relationship, end wall extensions disposed at opposite sides of said outer cylinder and extending from the opposite ends of said outer cylinder toward the mid-length location thereof, resilient means interconnecting complementary extensions extending from opposite ends of said outer cylinder to resiliently hold said end walls against the ends of said outer cylinder, and spikes projecting inwardly onefrom each end wall substantially at the center thereof and received in the apertures in the corresponding inner cylinder end closure plates to maintain said inner cylinder substantially coaxial with said outer cylinder.

'2. A form for casting tubular objects comprising a contractile inner cylinder having a longitudinally extending slot therein, a spacer disposed in said slot holding said inner cylinder in expanded condition, end closure plates disposed one in each end of said inner cylinder, an expansile outer cylinder receiving said inner cylinder and having a longitudinally extending slot therein, end walls disposed one at each end of said outer cylinder and engaging the latter at opposite sides of the slot therein to hold said outer cylinder in contracted condition, resilient means connected between said end walls resiliently holding the latter against the respectively opposite ends of said outer cylinder, and means acting between each end wall and the adjacent end closure plate holding said inner cylinder substantially coaxial with said outer cylinder.

3. A form for casting tubular objects comprising a contractile inner cylinder having a longitudinally extending slot therein, a spacer disposed in said slot holding said inner cylinder in expanded condition, end closure plates disposed one in each end oi said inner cylinder, an expansile outer cylinder receiving said inner cylinder and having a longitudinally extending slot therein, end walls disposed one at each end of said outer cylinder and engaging the latter at opposite sides of the slot therein to hold said outer cylinder in contracted' condition, resilient means connected between said end walls resiliently holding the latter against the respectively opposite ends of said outer cylinder, and means acting between each end wall and the adjacent end closure plate holding said inner cylinder substantially coaxial with said outer cylinder, said inner and outer cylinders being formed of resilient sheet metal, and

.: said spacer, said end closure plates and said end walls being formed of sheet metal of heavier gauge than the sheet metal of said cylinders.

LYLE G. OSBORN.

N 0 references cited. 

